I heart foo_dsp_delta!
Reply #9 – 2005-02-28 21:09:22
it seems that the treble is a lot high in the musics, i turned the settings to 60% and now its all good, without the DSP enabled the treble in the music seem a little bit layed out or cutted off, something like that...Hehe, I'm tempted to create a snake oil urban legend around it wonder how long it takes before this will become a "fact" but i want some more tecnical explanations about, someone? /tongue in cheek/ You see, the oversampling DAC you most certainly use has to unavoidably do some digital filtering on the signal to do its job, which resembles something opposite to what this dsp does - and as a side affect is causing music a little bit layed out or cutted off in highs, something like that... So this noise sharpening is sorta undoing the damage by predistorting the signal in a manner that gets again undone by the DAC later. In effect, you get "more realistic" music, "as it was recorded". Now you can get the glimpse of why many audiophiles accept only non-oversampling purist DACs. And, um, you can get that without spending $$$$ now. /tongue in cheek/ Well, in reality, you experience loudness race in its purest form - that which sounds louder feels to sound better. You get used to it very fast, and turning back is pain. It mixes derivative of the signal (difference to previous sample) with signal itself. Amplitude of this derivative is higher with higher frequencies, thats why only treble is notably affected. It is a sort of equalizer that increases treble in dependence to high frequency content amplitude - higher amplitude signals get increased more than lower amplitude content. It feels like "curtain has been unvelied" Anyone remember Dolby B in tapes sounding better without undoing Dolby compression?